Abjuration of the realm was a type of abjuration in ancient English law that was a renunciation of citizenship, a type of self-imposed exile. The person taking the oath swore never to return to the kingdom unless by permissionoun This was often taken by fugitives who had taken sanctuary:

I swear on the Holy Book that I will leave the realm of England and never return without the express permission of my Lord the King or his heirs. I will hasten by the direct road to the port allotted to me and not leave the King's highway under pain of arrest or executionoun I will not stay at one place more than one night and will seek diligently for a passage across the sea as soon as I arrive, delaying only one tide if possible. If I cannot secure such passage, I will walk into the sea up to my knees every day as a token of my desire to cross. And if I fail in all this, then peril shall be my lot.